手动正常停车时,先将丙烷制冷压缩机负荷用“DEG”降至()
A、10%
B、5%
C、0
D、15%
参考答案:C
— _______will your mother come back?
— In two days.
A.How often
B.How long
C.How soon
D.How far
巷道净宽误差范围符合GB50213—2010的要求:锚网(索)有中线的(),无中线的-50~200mm
A、50~100mm
B、100~200mm
C、0~100mm